They all have the same genetic code. The differences are simply which codes are dominant.
No, they all have variations in their genetic code. Two organisms with the exact same genetic codes are called twins. You're saying that all music is identical because they all contain the same set of musical notes. The difference lies in how those notes are arranged.
But, if you believe in a human origin from a single pair of humans ... how is it that their DNA isn't prevalent in all their human descendants? If Adam and Eve were black, for example, where did Asians come from, or the Swedes?
I'm a 6-2 blonde Viking. In my DNA there is also code for me to be a 5-1 Asian. It's all just a matter of which ones are dominate.
Someone has no idea, but learned the words dominate & recessive in dumb dumb biology class.
Learn.
In practice, active stretches of DNA must be copied as a similar message molecule called RNA. The words in the RNA then need to be "read" to produce the proteins, which are themselves stretches of words made up of a different alphabet, the amino acid alphabet. Nobel laureates Linus Pauling, who discerned the structure of proteins, and James Watson and Francis Crick, who later deciphered the helical structure of DNA, helped us to understand this "Central Dogma" of heredity--that the DNA code turns into an RNA message that has the ability to organize 20 amino acids into a complex protein: DNA -> RNA -> Protein.
To understand how this all comes together, consider the trait for blue eyes. DNA for a blue-eyes gene is copied as a blue-eyes RNA message. That message is then translated into the blue protein pigments found in the cells of the eye. For every trait we have--eye color, skin color and so on--there is a gene or group of genes that controls the trait by producing first the message and then the protein. Sperm cells and eggs cells are specialized to carry DNA in such a way that, at fertilization, a new individual with traits from both its mother and father is created.
How are traits passed on through DNA?
What are Dominant and Recessive?